The Jobu Design LF-C604 Replacement Foot for Canon 600mm f/4, 800mm f/5.6 & 400mm f/2.8 Lenses replaces the factory foot of your Canon lens and introduces an Arca Swiss-style profile, for easy attachment to a corresponding quick-release clamp of a Gimbal or other head. With the Arca-style profile integrated into the foot, the stack height is reduced and things stay lower in profile.
Made of CNC billet aluminum and hard-anodized in black, the Replacement Foot installs easily by using the four M4 screws that came with your lens. A long-reach Allen key is included (M3 size). The bottom of the foot features two safety stop screws (M3 size) that prevent the lens from sliding out of the quick-release element, in the event that the clamp is inadvertently left loose. This prevents potential damage to your valuable equipment.